CN205453147U - Three -phase unbalanced load adjusting device - Google Patents

Abstract

The embodiment of the utility model discloses a three-phase load unbalance adjustment device, which includes: a three-phase low-voltage circuit breaker connected with the three-phase circuit, and the three-phase output terminals of the three-phase low-voltage circuit breaker are respectively connected with the first contactor, the second The contactor is connected to the input end of the third contactor, the output end of the first contactor is connected to the output end of the second contactor, and the output end of the first contactor is connected to the output end of the third contactor. The output terminals of the three contactors of the device are connected together to form a single-phase output terminal with the neutral line. During operation, only one of the three contactors is connected, and there is no need to disconnect the circuit when changing phases. For the switch, you only need to disconnect the contactor that should be connected first, and then switch the other contactor to connect. The operation is simple and convenient, and the switching speed of the phase change is fast, which shortens the power failure time, reduces the power failure range, and improves the reliability of power supply. Sex, effectively reducing the three-phase unbalance.

Description

A three-phase load unbalance adjustment device

technical field

The utility model relates to the technical field of electric equipment, in particular to a three-phase load unbalance adjustment device.

Background technique

At present, in the power supply and distribution network, three-phase alternating current is often used to transmit electric energy. The three-phase AC power supply is a power supply composed of three AC potentials with equal frequency and amplitude, and the phases are sequentially different from each other by 120 degrees.

In practical applications, there is a common phenomenon of three-phase unbalance, that is, there will be situations where the three-phase current or voltage amplitudes are inconsistent, and the amplitude difference exceeds the specified range. Three-phase unbalance will cause a certain degree of damage to the line and transformer. In order to improve the ubiquitous three-phase unbalance phenomenon in the low-voltage power grid, the current method is to first test the load of the station area (the power supply area of the transformer), calculate the unbalanced degree of the three-phase load, and then manually adjust the load. Before the adjustment, the entire low-voltage station area must be powered off, and then the branch line with a large load on the low-voltage line should be adjusted. Every time a T contact is adjusted, it takes a long time from the work ticket to the end of the work, which not only affects the normal electricity consumption of the user, but also causes the loss of electricity fee income of the power supply company.

Therefore, how to shorten the power outage time during the adjustment process, improve the reliability of power supply, and effectively reduce the three-phase unbalance is a technical problem to be solved by those skilled in the art.

Utility model content

The purpose of the utility model is to provide a three-phase load unbalance adjustment device, which can shorten the power failure time during the adjustment process, improve the reliability of power supply, and effectively reduce the three-phase unbalance degree.

In order to solve the above technical problems, the utility model provides the following technical solutions:

A three-phase load unbalance adjustment device, comprising: a three-phase low-voltage circuit breaker connected to a three-phase circuit, the three-phase output terminals of the three-phase low-voltage circuit breaker are respectively connected to the first contactor, the second contactor and the third The input end of the contactor is connected, the output end of the first contactor is connected with the output end of the second contactor, and the output end of the first contactor is connected with the output end of the third contactor.

Preferably, the first contactor includes a first contactor body and a phase A start button and a phase A stop button for controlling the first contactor to be turned on and off.

Preferably, the second contactor includes a second contactor body, a phase B start button and a phase B stop button for controlling the second contactor to be turned on and off.

Preferably, the third contactor includes a third contactor body, a C-phase start button and a C-phase stop button for controlling on-off of the third contactor.

Preferably, it also includes:

They are respectively connected with the first contactor, the second contactor and the third contactor, and are used as indicator lights for indicating the working phase sequence.

Preferably, it also includes:

An electrical interlocking circuit that is connected with the first contactor, the second contactor and the third contactor and controls at most one of the first contactor, the second contactor and the third contactor in an operating state.

Preferably, it also includes:

The housing of the three-phase load unbalance adjustment device, the housing of the three-phase load unbalance adjustment device includes a switch door, the three-phase low-voltage circuit breaker, the first contactor, the second contactor and the third contactor are fixedly arranged In the housing of the three-phase load unbalance adjustment device, the A-phase start button, A-phase stop button, B-phase start button, B-phase stop button, C-phase start button, C-phase stop button and indicator lights are arranged on the On the box panel of the three-phase load unbalance adjustment device housing.

Compared with the prior art, the above-mentioned technical solution has the following advantages:

The three-phase load unbalance adjustment device provided by the embodiment of the utility model includes: a three-phase low-voltage circuit breaker connected to the three-phase circuit, and the three-phase output terminals of the three-phase low-voltage circuit breaker are respectively connected to the first contactor and the second contactor. The output end of the first contactor is connected to the output end of the second contactor, and the output end of the first contactor is connected to the output end of the third contactor. The output terminals of the three contactors of the device are connected together to form a single-phase output terminal with the neutral line. During operation, only one of the three contactors is connected, and there is no need to disconnect the circuit when changing phases. For the switch, you only need to disconnect the connected contactor first, and then switch the other contactor to connect. The operation is simple and convenient, and the switching speed is fast, which shortens the power failure time, reduces the power failure range, and improves the reliability of power supply. Sex, effectively reducing the three-phase unbalance.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present utility model. Those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a structural schematic diagram of a three-phase load unbalance adjustment device provided by a specific embodiment of the present invention;

Fig. 2 is a schematic diagram of the electrical interlock control principle of the three-phase load unbalance adjustment device provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the appearance and structure of the three-phase load unbalance adjustment device provided by an embodiment of the present invention.

detailed description

The core of the utility model is to provide a three-phase load unbalance adjustment device, which can shorten the power failure time during the adjustment process, improve the reliability of power supply, and effectively reduce the three-phase unbalance degree.

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings.

In the following description, specific details are set forth in order to provide a full understanding of the present invention. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar extensions without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below.

Please refer to FIG. 1 , which is a schematic structural diagram of a three-phase load unbalance adjustment device provided by a specific embodiment of the present invention.

A specific embodiment of the utility model provides a three-phase load unbalance adjustment device, including: a three-phase low-voltage circuit breaker 1 connected to a three-phase circuit, and the three-phase output terminals of the three-phase low-voltage circuit breaker 1 are respectively connected to the first The input ends of a contactor 2, the second contactor 3 and the third contactor 4 are connected, the output end of the first contactor 2 is connected with the output end of the second contactor 3, and the output end of the first contactor 2 is connected with the third Output terminal of contactor 4.

As shown in Figure 1, the three phases A, B, and C of the three-phase circuit are respectively connected to the three input terminals of the three-phase low-voltage circuit breaker 1, and the three input terminals of the three-phase low-voltage circuit breaker 1 correspond to one output terminal, and the three The three output terminals of the phase low-voltage circuit breaker 1 are respectively connected to the input terminals of the first contactor 2, the second contactor 3 and the third contactor 4, and the output terminals of the three contactors are connected together to form a common output terminal, and The neutral line 5 constitutes a single-phase output terminal to be connected to the load. In application, only one of the three contactors is connected. When the three-phase load unbalance exceeds the preset threshold, it needs to change phases. At this time, there is no need to disconnect the three-phase low-voltage circuit breaker, just disconnect the current working The corresponding contactor, and then switch the contactor that needs to work. The operation is simple and convenient, the commutation switching speed is fast, and the power failure time is only equal to the contactor switching time, which greatly shortens the power failure time, and only needs to adjust the power failure of the branch line with a heavy load of the low-voltage line, without power failure of the entire low-voltage station. The scope of power failure is reduced, the reliability of power supply is improved, and the fast phase change can quickly adjust the faulty phase, effectively reducing the three-phase unbalance.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of the electrical interlock control principle of the three-phase load unbalance adjustment device provided by an embodiment of the present invention.

On the basis of the above embodiments, in one embodiment of the present invention, the first contactor includes a first contactor body and a phase A start button 211 and a phase A stop button 212 for controlling the first contactor to be turned on and off. The second contactor includes a second contactor body and a B-phase start button 221 and a B-phase stop button 222 for controlling the on-off of the second contactor. The third contactor includes a third contactor body and a C-phase start button 231 and a C-phase stop button 232 for controlling the on-off of the third contactor. Further, the device also includes: an indicator light connected to the first contactor, the second contactor and the third contactor respectively for indicating the working phase sequence, wherein the indicator light includes a first contactor connected to the first contactor Indicator light 241, the second indicator light 242 that is connected with the second contactor, the 3rd indicator light 243 that is connected with the 3rd contactor; Be connected with the first contactor, the second contactor and the 3rd contactor, control the first An electrical interlock circuit in which at most one of the contactor, the second contactor and the third contactor is in working condition.

In order to further facilitate the commutation operation, each contactor is provided with a start button and a stop button corresponding to the phase. When it is necessary to change the phase, you only need to press the stop button of the working phase first, and then press the start button of the phase to be connected. There is an electrical interlock circuit in the device, and its principle is shown in Figure 2. KMa is the contact of the first contactor, KMb is the contact of the second contactor, and KMc is the contact of the third contactor. After the corresponding contactor of the phase is disconnected, it needs to be connected to the corresponding contactor of the phase to attract and connect, avoiding the short circuit phenomenon caused by misoperation.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of the appearance and structure of a three-phase load unbalance adjustment device provided by an embodiment of the present invention.

In one embodiment of the present invention, the three-phase load unbalance adjustment device further includes: a three-phase load unbalance adjustment device housing 31, the three-phase load unbalance adjustment device housing includes a switch door, three-phase low-voltage circuit breaker The first contactor, the second contactor and the third contactor are fixedly arranged in the housing of the three-phase load unbalance adjustment device, A phase start button 211, A phase stop button 212, B phase start button 221, B phase stop The button 222, the C-phase start button 231, the C-phase stop button 232 and the indicator lights are arranged on the box panel of the three-phase load unbalance adjustment device housing.

The functional components of the three-phase load unbalance adjustment device are integrated into the three-phase load unbalance adjustment device housing, which can improve the safety of the operation. During the phase change operation, there is no need to open the switch door, which avoids accidents during the user's operation. Electric shock accident.

To sum up, when the three-phase load unbalance adjustment device provided by the embodiment of the utility model is applied, only one of the three contactors is connected. When the three-phase load unbalance exceeds the preset threshold, it needs to Phase commutation, at this time, there is no need to disconnect the three-phase low-voltage circuit breaker, just disconnect the contactor corresponding to the current work, and then switch and connect the contactor that needs to work. The operation is simple and convenient, the commutation switching speed is fast, and the power failure time is only equal to the contactor switching time, which greatly shortens the power failure time, and only needs to adjust the power failure of the branch line with a heavy load of the low-voltage line, without power failure of the entire low-voltage station. The power failure range is reduced, the power supply reliability is improved, and the fast phase change can quickly adjust the heavy load phase, effectively reducing the three-phase unbalance.

The above is a detailed introduction to the three-phase load unbalance adjustment device provided by the utility model. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (7)

1. A three-phase load unbalance adjustment device, characterized in that it comprises: a three-phase low-voltage circuit breaker connected to a three-phase circuit, the three-phase output terminals of the three-phase low-voltage circuit breaker are respectively connected to the first contactor, the second The input ends of the second contactor and the third contactor are connected, the output end of the first contactor is connected with the output end of the second contactor, and the output end of the first contactor is connected with the output end of the third contactor. output. 2 . The device according to claim 1 , wherein the first contactor comprises a first contactor body and a phase A start button and a phase A stop button for controlling the first contactor to be turned on and off. 3 . 3 . The device according to claim 2 , wherein the second contactor comprises a second contactor body and a phase B start button and a phase B stop button for controlling the second contactor to be turned on and off. 4 . 4 . The device according to claim 3 , wherein the third contactor comprises a third contactor body and a phase C start button and a phase C stop button for controlling the third contactor to be turned on and off. 5. The device according to claim 4, further comprising: They are respectively connected with the first contactor, the second contactor and the third contactor, and are used as indicator lights for indicating the working phase sequence. 6. The device according to claim 5, further comprising: An electrical interlocking circuit that is connected with the first contactor, the second contactor and the third contactor and controls at most one of the first contactor, the second contactor and the third contactor in an operating state. 7. The device according to claim 5, further comprising: The housing of the three-phase load unbalance adjustment device, the housing of the three-phase load unbalance adjustment device includes a switch door, the three-phase low-voltage circuit breaker, the first contactor, the second contactor and the third contactor are fixedly arranged In the housing of the three-phase load unbalance adjustment device, the A-phase start button, A-phase stop button, B-phase start button, B-phase stop button, C-phase start button, C-phase stop button and indicator lights are arranged on the On the box panel of the three-phase load unbalance adjustment device housing.